import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble();
        double b = sc.nextDouble();
        double c = sc.nextDouble();
        double d = sc.nextDouble();
        double e = sc.nextDouble();
        RR RR = new RR(a,b,c,d,e);
        double dd = RR.fun();
        System.out.printf("%.2f",dd);
    }
}
class RR{
    double a;
    double b;
    double c;
    double d;
    double e;


    public RR(double a,double b, double c,double d,double e){
        this.a = a;
        this.b = b;
        this.c = c;
        this.d = d;
        this.e = e;
    }
    public double fun(){
        return c;
    }

}